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Anonymous Poster

Neutral of single phase transformer

04/23/2010 1:01 PM

We are using a single phase transformer, 15 KVA, 480/120V. The primary is fed by line to line voltage. The transfomer will be using for lighting. In secondary side, which terminal is phase and which one neutral.
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rakesh_semwal
Guru
India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Oct 2006
Location: India, 200 Km. North of Delhi.
Posts: 1393
Good Answers: 53
#1

Re: Neutral of single phase transformer

04/23/2010 1:07 PM

None, Neutral lies exactly at the center tap of transformer's secondary winding, which may not be accessible to you,
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msamad
Guru

Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#2
In reply to #1

Re: Neutral of single phase transformer

04/23/2010 6:59 PM

You can connect one of the secondary terminals to ground and the grounded terminal is the neutral, other terminal is phase.

See the figure 15.11 in page 15.9 of this document.

http://www.mhprofessional.com/downloads/products/0071467890/0071467890_ch15.pdf

- MS

__________________
 "All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
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Signode
Power-User

Join Date: Aug 2007
Location: Lahore
Posts: 369
#3
In reply to #2

Re: Neutral of single phase transformer

04/24/2010 12:16 AM

It means your transformer is not an isolation type. Connect anyone terminal with ground. Neutral is in case of center tap transformer.

__________________
 Don't assume any thing, always check/ask and clear yourself
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Anonymous Poster
#4
In reply to #3

Re: Neutral of single phase transformer

04/24/2010 12:26 AM

It means your transformer is not an isolation type ?

MS is correct, no further addition was required. A single word was enough "Anyone"

Adding the information is to create an unnecessary confusion for OP, which we should avoid, considering the level of enquiry.
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Anonymous Poster
#5

Re: Neutral of single phase transformer

04/24/2010 2:39 PM

guest; masmad is correct, i would put a 125 amp fuse in the ungrounded line. perry
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